Photocatalytic degradation and rate constant prediction of chlorophenols and bisphenols by H3PW12O40/GR/TiO2 composite membrane

Bimetallic FeOx–MOx Loaded TiO2 (M = Cu, Co) Nanocomposite Photocatalysts for Complete Mineralization of Herbicides

“…This could be due to the difference in the oxygen functional groups (hydroxyl and acetic acid) on the aromatic ring for both classes of chlorinated herbicides, and likely the acetic acid group can be readily degraded. It is widely reported that 2,4,6-TCP degrades faster than 2,4-DCP during photocatalytic water treatment, consistent with our results in Figure . − However, there is no clear relationship between the degradation rate of chlorophenols and number of chlorine substituents on the aromatic ring, but the position of Cl atoms was reported to highly determine the order of initial degradation rates. , In the first 90 min, 2,4-DCP is the most difficult to mineralize, while 2,4-D and 2,4,5-T (with similar trend) are the easiest to mineralize. The temporal UV–vis absorption spectra of the four herbicides at 90 min of photocatalytic degradation on FeO x –CoO x /TiO 2 are shown in Figure S9a–d.…”

“…In order to investigate how the chlorine substituents and other functional groups on the aromatic benzene ring influence photocatalytic degradation activity, two chlorophenols (2,4-DCP and 2,4,6-TCP) and two chlorinated herbicides (2,4-D and 2,4,5-T) were evaluated using the optimized photocatalyst composite. It was reported that the number and positions of the chlorine substituents play vital roles in predicting the level of toxicity and degradation rate of each members of the chlorinated phenols group. − Based on the results in Figure , the two chlorophenols are more difficult to mineralize compared to their phenoxyacetic acid counterparts. This could be due to the difference in the oxygen functional groups (hydroxyl and acetic acid) on the aromatic ring for both classes of chlorinated herbicides, and likely the acetic acid group can be readily degraded.…”

A simple preparation method of in situ oxidized titanium carbide MXene for photocatalytic degradation of catechol

“…Among these, semiconductor-based photocatalysis is considered to be one of the most promising techniques in the sewage treatment field due to its attractive advantages of innocuity, low energy consumption, robust oxidizability, and no secondary pollution. 18–20…”

“…Among these, semiconductor-based photocatalysis is considered to be one of the most promising techniques in the sewage treatment field due to its attractive advantages of innocuity, low energy consumption, robust oxidizability, and no secondary pollution. [18][19][20] Titanium dioxide (TiO 2 ) has been receiving widespread research attention as an important photocatalyst in sewage treatment due to its long-term stability, high catalytic reactivity, low cost, and nontoxicity. [21][22][23] However, considering the rapid recombination of electron-hole (e À -h + ) pairs, the photocatalytic efficiency of pure TiO 2 is limited to a great degree.…”